<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    //无参无返回值
    function f1(){
         console.log(f1)
    }
    f1();
    //有参无返回值
    function f2(name,age) {
        console.log(name+":"+age)
    }
    f2("张三",18)

    //无参有返回值
    function f3(){
        return"我是返回值"
    }
    let info = f3;
    console.log(info);

    //有参有返回值
    function  f4(x,y){
        return x*y;
    }
    let result = f4(8,9);
    console.log(result);


</script>

</body>
</html>